Pin-tumbler lock



Sam., 23 19% 1,509,594

J. B. FREYSINGER PIN TUMBLER LOCK Filed Aug. 23, 1.922

Patented Sept. 23, 1,924,

satana UNITED STATES PATENT OFFICE.

.TOI-IN B. FREYSINGER, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE t TO'WNE MANUFACTURING COMPANY, Oli` STAMFORD, CONNECTICUT.

PIN-TUMBLER LOCK.

Application filed August 23, 1922.

To aZZ whom t may concer/n."

Be it known that I, JOHN B. FREYSINGER, a citizen of the United States, and resident of Stamford, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Pin- Tumbler Locks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates t'o improvements in locks and more particularly to those of the cylinder or pin tumbler type,-one object of the invention being to so construct a lock of this character that the key may be withdrawn after a one-half rotation of the plug and so that the tumbler drivers shall cooperate with the plug after such half rotation of the latter that said plug shall become locked in such position against further turning` after the key has been withdrawn and until the key shall have been again inserted into the plug.

With this and other objects in view, the invention consists in certain novel features of construction as hereinafter set forth and pointed out in t-he claim.

ln the accompanying drawings,-

Figure l is a view partly in side elevation and partly in longitudinal section showing an embodiment of my invention.

F'gure 2 is a transverse sectional view showing positions of the parts after the plug has been given a one half turn and the key withdrawn, and

Figure 3 is a transverse sectional view showing the positions of "the parts after the plug has been given a full rotation and the key withdrawn.,

The lock comprises a cylinder l and a plug 2, the latter having therein pin tumblers 3 and the former provided therein with spring pressed drivers l as is common in locks of this type.

The cylinder l is provided, diametrically opposite the drivers 4, with pockets 5 for the reception of plungers 6, the latterfbeing pressed toward the plug 2 by means of springs 7 and said plungers are made slight- Serial No. 588,912.

ly larger than the bores in the plug in which the tumblers 3 are located so that said plungers cannot enter said bores. By reason of the provision of the spring pressed plungers 6, l am enabled to withdraw the key from the plug after a one half rotation has been imparted to the latter.

The plug 2 is provided with a longitudinal recess or groove 8 sulticient in size to receive the spring pressed drivers l after the plug shall have been given a 'one half rotation, as indicated in Figure 2. The drivers 4e thus cri-operate with the plug to lock the same and hold it against turning after the ,key has been withdrawn. Upon again inserting the key into the plug, the drivers will be lifted out of the groove or recess 8 by the bottom edge of the key and the plug will then be permitted to be turned by the key to ineke another half rotation when the key will be withdrawn and the parts will as:- sume the positions shown in Figure 8.

Various slight changes might be made in the details of construction of my invention without departing from the spirit thereof or limiting its scope and hence l do not wish to restrict myself to the precise details herein set forth.

Alaving ."ully described my invention what ll claim. as new and desire to secure by Letters-Patent, is:

ln a pin tumbler lock, the combination of a cylinder, spring pressed drivers mounted in one side of the cylinder, a plug having bores, pin tumblers mounted in said bores, plunger-s mounted in the cylinder diametrically opposite the spring-pressed drivers and each being greater in diameter than each of the bores in the plug, said plug having a longitudinal groove to receive said drivers when the plug shall have been given a onehalf turn.

In testimony whereof, l have signed this specification in the presence of two subscribing witnesses.

JOHN B. FREYSINGER. Witnesses:

CHARLES A. BERRY, Oms. Lehmu 

